This Week's Claude Code, Codex, and Gemini CLI Update Roundup

Original sourcedev.to

Summary

This week's Claude Code, Codex, and Gemini CLI updates center on the retirement of Opus 4.8 fast mode and expanded support for idle compaction. Users must migrate fast mode from Opus 4.8 to Opus 5.5 by November 30, 2026; after the deadline, fast mode requests will error out and won't automatically…

Key points

Summarizes the migrations and configuration changes developers using coding agents daily must complete before the deadline.
Fast mode will error out once it expires, and unmigrated scripts will fail outright by the end of November.
Developers should check for fast mode calls in scripts and IDE settings, switch to Opus 5.5 before the deadline, and review new security defaults.

開發者工作流

Editorial note

This page is Code & Chain's editorial summary of public sources. It may be prepared with AI assistance and published through an automated workflow. Refer to the original sources; this content is not investment, legal, or tax advice.